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java.lang.NullPointerException: 	at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:338)	at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1212)	at org.eclipse.wst.common.project.facet.core.util.internal.PluginUtil.loadClass(PluginUtil.java:197)	at org.eclipse.wst.common.project.facet.core.util.internal.PluginUtil.instantiate(PluginUtil.java:250)	at org.eclipse.wst.common.project.facet.core.internal.ActionDefinition.getDelegate(ActionDefinition.java:164)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.modifyInternal(FacetedProject.java:433)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChangesInternal(FacetedProject.java:1181)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.access$2(FacetedProject.java:1117)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProject$5.run(FacetedProject.java:1099)	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProject.mergeChanges(FacetedProject.java:1109)	at org.eclipse.wst.common.project.facet.core.internal.FacetedProjectWorkingCopy.commitChanges(FacetedProjectWorkingCopy.java:2020)	at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$4.run(FacetsPropertyPage.java:232)	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2344)	at org.eclipse.wst.common.project.facet.ui.internal.FacetsPropertyPage$5.run(FacetsPropertyPage.java:246)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)